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11 Cards in this Set
- Front
- Back
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Should you teach the rule for multiplying decimals?
Why or why not? |
No. Don't teach the rule.
Use these techniques to help the kids understand: Using calculators to find patterns Change decimals to fractions for better understanding Use place value and knowledge that tenths time tenths is hundredths |
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What are some activities for introducing solid geometry?
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Who am I?
Who stacks? How are we alike or different? Who doesn't belong? How many faces do I have? |
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What two concepts of prior knowledge are needed before introducing fractions?
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Partitioning: sharing things equally
Equivalence: different representations of the same amount |
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What is the Van Hiele Model?
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• 0=Visualization: View geometric shape as a whole (Circle because it looks like a Frisbee)
• 1=Analysis: Recognize properties of figures (4 sides and four corners) • 2=Informal Deduction: See relationships between properties of classes of shapes (all angles are right angles and opposite sides are parallel) • 3=Deduction: Use axiomatic system to prove statements (high school geometry) • 4=Rigor: See geometry in the abstract (analytic geometry and beyond) |
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First properties that children focus on in geometry
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• Properties of a shape (# of sides, # of corners, symmetry, length of side, size of angles, parallel and perpendicular sides, convexity and concavity, and altitude)
• Names of geometric shapes • Relationships between shapes (congruence & similarity) • Classification schemes |
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Teaching symmetry
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Miras
Hold and fold Monster Molly with mirrors |
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Number of sides and corners
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Number of sides = number of corners
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Size of angles
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Acute (less than 90)
Right (90) Obtuse (between 90 and 180) Straight (180) Reflex (greater than 180) |
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Parallel and perpendicular lines
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Parallel lines go on forever and do not cross
Perpendicular lines cross at a right angle |
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Altitude
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height of the shape
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Examples of quadrilaterals
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Any four-sided figure
Square Diamond Rectangle Parallelogram Trapezoid |
